Question

tính bằng cách thuận tiện: 4/9 x 19/24 + 19/24 x 7/9 -19/24 x 2/9?
giúp mình với?

Answer 1

( 4/9 + 7/9 -  2/9 ) x 19/24  = 1 x 19/24 = 19/24

Answer 2

\(=\dfrac{19}{24}\times\left(\dfrac{4}{9}+\dfrac{7}{9}-\dfrac{2}{9}\right)=\dfrac{19}{24}\times1=\dfrac{19}{24}\)

Answer 3

\(\dfrac{19}{24}\times\left(\dfrac{4}{9}+\dfrac{7}{9}-\dfrac{2}{9}\right)\)

\(=\dfrac{19}{24}\times1=\dfrac{19}{24}\)